Rotating drawing off basins attached to glass furnaces



Dec. 10, 1935. E ROIVRANT 2,023,746

ROTATING DRAWING OFF BASINSATTACHED TO GLASS FURNACES Filed Nov. 8, 1954Patented Dec. 10, 1935 UNITED STATES" PATENT OFFICE ROTATING DRAWING OFFBASINS AT- TAGHED T GLASS FURNACES France pplication November 8,

1934, Serial No. 152,132

In France September 20, 1934 I 1 Claim, (Cl. 49-56) The inventiondescribed in the United States patent application filed on the3rdFebruary 1934, under Serial No. 709,596, concerned rotating drawing ofibasins attached to glass furnaces and receiving an intermittent movementof rotation synchronically with the intermittent movement of rotation ofparison moulds drawing off glass from these :basins and arrested at thetime of suction.

The said patent application also comprised a .plant in which theintermittent movement of rotation of the basin is ruled by such a lawthat a mass of glass, from which glass has been drawn oil, is displacedrelatively to the drawing oil point, after the basin has efiected a fullrevolution, so that any mass of glass, degraded by a drawing 01foperation, executes several revolutions before becoming stationary againat thesuction station.

The present invention has for its object to improve theoperation of suchplants and consists in giving to the angle of intermittent rotation ofthe basin a small valu relatively to the angle of intermittent rotationof the drawing of! moulds.

In these conditions, when a given drawing ofi mould returns to thesuction or drawing off point after a cycle of the machine,.the, basin,during this cycle, has effected only a fraction of a revolution,

I By'designating by w the angle of intermittent .rotation of the basin,by n the angle of intermittent rotation of the drawing oii moulds, ifthe ratio is equal to $4,, to A, or to %,,etc. the zones in which amould has drawn of! glass each remain the atmosphere.

This feature can be associated as follows with the above mentioned lawof movement:

If, in the example considered above, it is moreover assumed that a zonein which a suction hasbeen eifected makes, for instance threerevolutions before becoming stationary again atlthe suction point, theinterval of time separating these two suction or drawing oif operationsin the same zone will be equal to (3x3) =9 times,

or (3x4) =12 times, or (3x5) =15 times the duration of a cycle of themachine.

Use can thus be made of a basin of very small diameter, owing to thefact that the re-heating of a cooled zone continues during a very longtime before this zone returns to the suction or drawing off point incontact with a drawing oif mould.

These features of the invention are illustrated in the accompanyingdrawing. The basin C receives an intermittent movement of rotation, theperiods of stoppage of which occur at the same initial instants and thesame durations as the periods of stoppage of thedrawing ofi moulds M,which are six in number in the example under consideratim.

Z designates the cooled trail left by a drawing ofl mould after 'adrawing ofi operation; Z Z Z. Z", Z designate the successive stations ofthis trail Z at the various points of stoppa e of the basin C in there-heating zone; it will be seen that, after the station 2", this zone,in which glass had been drawn ofl at the beginning of the revolution,comes to Z, beyond the drawing v ofi point and, consequently, is notsubjected to 2 any drawing 0!! operation. The mould which, at

this moment, reaches the drawing off point, will therefore draw offnondegraded glass. Moreover, it will be seen that, when the machine haseffected a full revolution (six stop- 30 7 pages of the moulds M) thebasin has moved only through a fraction of a revolution, so that thecooled zone is subjected to a long period of reheating before returningto the narrow uncovered sec- 1 i201.

I claim:

A method of drawing oif glass in a rotating basin supplied by a glassfurnace-and almosti completely covered by the hood of the furnace sothat only anarrow uncovered sector is ex- 4 I posed to the outer air,saidmethod consisting in effecting the drawing of! operation at a fixedsta-. tion corresponding to the uncovered sectorby means of a series ofmolds to which an intermittent movement of rotation is imparted andwhich 5 .are successively stopped at .the said fixed station, and inimparting to the basin an intermittent movement of rotation synchronouswith the intermittent movement of rotation of the molds, the laws of thetwo movements being such that ,the number of revolutions effected by themolds during a predetermined period is a multiple of. the number ofrevolutions efiected by the basin during the same period.

' EMILE ROIRANT.

